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MPL 20x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020130

GTIN/EAN: 5906301811367

5.00

length

20 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.9 g

Magnetization Direction

↑ axial

Load capacity

2.33 kg / 22.90 N

Magnetic Induction

370.68 mT / 3707 Gs

Coating

[NiCuNi] Nickel

0.394 with VAT / pcs + price for transport

0.320 ZŁ net + 23% VAT / pcs

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Technical data of the product - MPL 20x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020130
GTIN/EAN 5906301811367
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 20 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.90 N
Magnetic Induction ~ ? 370.68 mT / 3707 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x3x2 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Technical analysis of the magnet - data

The following information represent the direct effect of a mathematical analysis. Results are based on algorithms for the material Nd2Fe14B. Operational performance may deviate from the simulation results. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MPL 20x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3700 Gs
370.0 mT
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
medium risk
1 mm 2103 Gs
210.3 mT
0.75 kg / 1.66 pounds
752.3 g / 7.4 N
weak grip
2 mm 1172 Gs
117.2 mT
0.23 kg / 0.52 pounds
233.7 g / 2.3 N
weak grip
3 mm 721 Gs
72.1 mT
0.09 kg / 0.20 pounds
88.5 g / 0.9 N
weak grip
5 mm 345 Gs
34.5 mT
0.02 kg / 0.04 pounds
20.3 g / 0.2 N
weak grip
10 mm 101 Gs
10.1 mT
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
weak grip
15 mm 42 Gs
4.2 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
weak grip
20 mm 21 Gs
2.1 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
weak grip
30 mm 7 Gs
0.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip

Table 2: Slippage force (wall)
MPL 20x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 pounds
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
2 mm Stal (~0.2) 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
3 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MPL 20x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 pounds
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 20x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
1 mm
25%
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
2 mm
50%
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
3 mm
75%
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
5 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
10 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
11 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
12 mm
100%
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
OK
40 °C -2.2% 2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
OK
60 °C -4.4% 2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
80 °C -6.6% 2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 pounds
1659.0 g / 16.3 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 20x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.06 kg / 11.17 pounds
4 866 Gs
0.76 kg / 1.67 pounds
760 g / 7.5 N
N/A
1 mm 3.01 kg / 6.64 pounds
5 705 Gs
0.45 kg / 1.00 pounds
452 g / 4.4 N
2.71 kg / 5.97 pounds
~0 Gs
2 mm 1.64 kg / 3.61 pounds
4 205 Gs
0.25 kg / 0.54 pounds
245 g / 2.4 N
1.47 kg / 3.24 pounds
~0 Gs
3 mm 0.89 kg / 1.97 pounds
3 106 Gs
0.13 kg / 0.29 pounds
134 g / 1.3 N
0.80 kg / 1.77 pounds
~0 Gs
5 mm 0.31 kg / 0.67 pounds
1 816 Gs
0.05 kg / 0.10 pounds
46 g / 0.4 N
0.27 kg / 0.61 pounds
~0 Gs
10 mm 0.04 kg / 0.10 pounds
690 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
0.04 kg / 0.09 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
202 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
24 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
14 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
9 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
6 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
5 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 20x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 51.34 km/h
(14.26 m/s)
0.09 J
30 mm 88.88 km/h
(24.69 m/s)
0.27 J
50 mm 114.74 km/h
(31.87 m/s)
0.46 J
100 mm 162.27 km/h
(45.08 m/s)
0.91 J

Table 9: Surface protection spec
MPL 20x3x2 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)

Table 10: Construction data (Flux)
MPL 20x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 748 Mx 17.5 µWb
Pc Coefficient 0.32 Low (Flat)

Table 11: Physics of underwater searching
MPL 20x3x2 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds just approx. 20-30% of its max power.

2. Steel saturation

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Temperature resistance

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Elemental analysis
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Sustainability
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020130-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x3x2 mm and a weight of 0.9 g, guarantees premium class connection. This rectangular block with a force of 22.90 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 20x3x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 20x3x2 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 2.33 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 20x3x2 / N38 model is magnetized axially (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (20x3 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 20x3x2 mm, which, at a weight of 0.9 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 2.33 kg (force ~22.90 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
  • Magnets effectively resist against demagnetization caused by external fields,
  • Thanks to the shiny finish, the plating of nickel, gold, or silver gives an aesthetic appearance,
  • Magnets exhibit impressive magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the potential of free forming and adaptation to specialized solutions, NdFeB magnets can be created in a broad palette of forms and dimensions, which makes them more universal,
  • Wide application in electronics industry – they find application in data components, electric drive systems, precision medical tools, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The specified lifting capacity represents the peak performance, recorded under ideal test conditions, meaning:
  • with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension reaches at least 10 mm
  • with a plane perfectly flat
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

What influences lifting capacity in practice

In practice, the real power depends on many variables, ranked from crucial:
  • Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
  • Steel type – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Impact on smartphones

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the sensors in your phone.

Crushing force

Protect your hands. Two powerful magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!

Risk of cracking

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Safe operation

Handle magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.

Allergic reactions

Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, cease handling magnets and use protective gear.

Demagnetization risk

Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Safe distance

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Mechanical processing

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Implant safety

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Danger to the youngest

NdFeB magnets are not intended for children. Swallowing a few magnets may result in them attracting across intestines, which constitutes a severe health hazard and requires immediate surgery.

Danger! Details about hazards in the article: Safety of working with magnets.